I stumbled upon this issue when I was going to add a coin. This coin:
https://en.numista.com/catalogue/pieces64187.html is the fifth type of the Swedish '1 Riksdaler' from 'Gustav II Adolf'. I believe the years are wrong. They're currently "confirmed" in the coin sheet. I believe they have checked the information of a Krause book and then validated it. In the Krause book (KM#143) these years are correct but my book says otherwise. In my book there are four varieties of this type of the coin (not two):
1631 (The year written as 1631)
1631 (The year written in Roman numerals MDCXXXI)
1632 (Correct turned coat of arms)
1632 (Incorrect turned coat of arms)
My book is Swedish and from 1977. The book is the most trusted Swedish numismatic publication. (The coinage of Sweden 1977 / Sveriges mynt 1521-1977)
I would be glad if someone could correct these years in the coin sheet because it causes a bit of confusion.